Re: shifter location first gen ls1/t56 with Holley mounts?
I took a bit of a different approach to this, although probably not one the purists amongst us will find acceptable. I enlarged the original hole as shown in the first photo. I spot welded nuts on the tunnel to attach the cover plate shown in the second photo. I used socket head bolts to attach the plate and used thin 1/8" thick self-stick (on one side) rubber foam strip tape (comes in a roll at the hardware) under it sandwiched between the tunnel and the plate to seal it off. The 2 longer 1/4-20 bolts shown partially inserted in the front of the cover plate are what I used to attach the extensions I made to hold down the front of my console. I figured if I ever needed to remove the shifter mechanism it's way easier to quickly pull out the seats and pull up the front piece of carpet than have to jack with the engine/trans under the car and there was already a hole there anyway. Makes it easy to fill the trans the first time; just pour in the ATF and bolt on the shifter plate/tower. Just food for thought.
'69 Z/28, Lemans Blue/White Stripes, DZ302, Tremec Magnum, 4.10, Procar Elite Seats,
Custom Upholstery, Dynatech headers, 17" VWW V45's, 235/45, 275/40, C5 Front Brakes